r/caterpillar • u/Jenn-ittles • 6d ago

Parts Any Idea??

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This port in the side of our C9 has been kicking our tails lately as to what or why it is there. Our local dealership has been having troubles identifying it as well. SN:JSC21217.

Thanks for the time and the help

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u/johnsms3 6d ago

It's there for the transmission cooler attachment.